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📁 C# Nuts and Bolt是学习C#的极好教程
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Subject: Compiler Error Messages - C# Nuts and Bolt - Beta2
Date: Wed, 29 Aug 2007 13:29:28 +0800
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<P class=3DMsoNormal><IMG id=3D_x0000_i1025 height=3D48=20
src=3D"http://www.vijaymukhi.com/documents/books/csadv/bpb.jpg" =
width=3D64></P>
<P class=3DMsoNormal><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-SIZE: 15pt; COLOR: black; FONT-FAMILY: Garamond">Chapter=20
10</SPAN></P>
<P class=3DMsoNormal><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></P>
<P class=3DMsoNormal><SPAN=20
style=3D"FONT-SIZE: 26pt; COLOR: black; FONT-FAMILY: Garamond">Compiler =
Error=20
Messages</SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">We will come across a =
large=20
number of errors that state Internal Compiler Error. These errors are =
extremely=20
dangerous as the compiler itself cannot figure them out. They fall under =
two=20
broad categories. <o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">One, we may have made =
some dumb=20
mistake which the developers at Microsoft may have not even thought off, =
thus=20
confusing the compiler thoroughly. <o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">Secondly, there could =
be a=20
genuine bug in the compiler. <o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">Take your pick. The =
first error=20
number CS0001 is an internal compiler error. A catch all phrase for 'I =
do not=20
know what went wrong'. <o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">Thus, the very first =
compiler=20
error number is thrown when the compiler is totally confused and doesn't =
know=20
how to react to the error. The compiler will resort to this error as the =
last=20
error before breaking down. Please understand the irony. The guys who =
wrote the=20
compiler could have made it the last error number but symbolically made =
it the=20
first. <o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">After studying the =
different=20
programming languages developed so far over a period, we figured out =
that the=20
best way to understand more about any programming language is by placing =

ourselves in the shoes of the sole person who wrote the language.=20
<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">This person did not =
write the=20
language per se but a compiler through which he expressed his philosophy =
of the=20
language. Thus, the only way out is to understand the million error =
messages we=20
receive. <o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">This process gets us =
into the=20
minds of a compiler, thus unearthing what it perceives is right and =
wrong with=20
our program. Thus, we have endeavored to sprinkle throughout our books =
every=20
error message the compiler can ever throw at us. <o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">After CS0001, we =
realized that=20
there was no error message CS0002. Since the numerical part of the error =
number=20
is the only one that changes, we concluded that there can be a maximum =
of only=20
9999 errors that we can ever make.<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">In today's world you =
will rarely=20
come across error number CS0003 as it signifies an out of memory =
condition. With=20
RAM so cheap today, we will never ever run out of memory. If we do, then =
the=20
compiler will use our hard disk as memory. This is called virtual =
memory, and if=20
you come across a CS0003 then consider yourself blessed. =
<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCprg><U>a.cs</U><o:p></o:p></P>
<P class=3DCprg>class zzz<o:p></o:p></P>
<P class=3DCprg>{<o:p></o:p></P>
<P class=3DCprg>public static void Main()<o:p></o:p></P>
<P class=3DCprg>{<o:p></o:p></P>
<P class=3DCprg>int i;<o:p></o:p></P>
<P class=3DCprg>}<o:p></o:p></P>
<P class=3DCprg>}<o:p></o:p></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCoutput><U>Compiler Warning</U><o:p></o:p></P>
<P class=3DCoutput>a.cs(5,5): warning CS0168: The variable 'i' is =
declared but=20
never used<o:p></o:p></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext">A variable when not =
used in the=20
program gives us a benign warning. Some software companies hate =
compilers=20
producing even a single warning. So, to convert warnings into errors, =
they=20
implement the /warnaserror option as in<o:p></o:p></SPAN></P>
<P class=3DCbase><SPAN style=3D"COLOR: windowtext"><![if =
!supportEmptyParas]><![endif]>&nbsp;<o:p></o:p></SPAN></P>
<P class=3DCoutput>&gt;csc /warnaserror a.cs <o:p></o:p></P>
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